Television apparatus



Oct. 6, 1931. c. o. VERMILLION I TELEVISION APPARATUS Filed Oct. s 1930 INVENTOR Charles 0. M ximilian.

ATTORNEY Patented Oct. 6, 1931 UNITE STATES PATENT OFFICE CHARLES 0. VERMILLION, OF BLOOMFIELD, NEW JERSEY, ASSIGNOR TO WIRED RADIO, INO., OF NEW YORK, N. Y., A CORPORATION OF DELAWARE TELEVISION APPARATUS Application filed October 8, 1930. Serial No. 487,120.

My invention pertains in general to television apparatus and specifically relates to mechanical means for momentarily retarding or accelerating the speed of rotation of a scanning disk employed in television.

In the transmission and reception of images by television it is important to maintain exact transmitting and rece1vsynchronism of the ing scanning disks. That is, the transmitting and receiving scanning disks must both rotate at exactly the same speed. It is equally important that the receiving scanning disk at all times occupies the same relative angular position as the transmitting scanning disk. In other words, the lead hole in the series of scanning holes in the receiving disk must, at any particular instant, be at the same angular position as the lead hole of the series of scanning holes in the transmitting scanning disk. The procedure of adjusting the receiver scanning hole into such proper relation with the transmitting scanning disk is commonly known as framing.

()ne of the objects of my invention consists in providing a mechanical arrangement whereby the speed of rotation of a scanning disk of a television system can be momentarily retarded or accelerated by a simple operation so as to properly frame the television image.

Another object of my invention consists in producing a system for transmitting motion from a driving motor to a scanning disk 111 which means are provided to momentarily alter the speed of the scanning disk while maintaining the speed of the motor constant.

These and other objects I accomplish in a novel arrangement of television apparatus in which a sprocket wheel mechanically coupled to a scanning disk is provided linearly movable along anendless chain driven by a motor.

In the drawings which accompany and form a part of this specification, and in which" likereference numerals designate corresponding parts throughout:

Fig. 1 is a perspective view of one embodimentof the arrangement of the television apparatus of my invention; and

2 is a fragmentary sectional view of 12 engages with another miter gear 15 which a gear and shaft employed in the embodiment of Fig. 1.

Referring to the drawings in detail, and particularly to Fig, 1, a scanning disk 1 is mounted upon a shaft 2, which is rotatably mounted in a supporting structure 3. The scanning disk 1 is of ordinary construction and has a spiral series of scanning holes 4 adapted to explore an image when the disk is rotated. The aperture 5 constitutes the lead hole of this series.

A miter gear 6 is rigidly secured to one end of the shaft 2 so as to engage with another miter gear 7 rigidly secured to a shaft 8, which is provided with a longitudinal slot 13. The shaft Sis rotatably mounted in bearing member 9 and in thrust bearing 10, as shown. The thrust bearing 10 is mounted on hearing member 11. The bearing members 9 and 11 are perpendicularly secured to the F mounting structure 3. Another miter gear 12 is slidably, but not rotatably, mounted upon the shaft 8.

Referring to Fig. 2, it will be seen that a pin 14 is mounted in the hub of the gear 12 so as to extend through the longitudinal slot 13 in the shaft 8 and prevent the independent rotation of the gear 12, but permit longitudinal movement thereof along the shaft 8.

Referring again to Fig. 1, the miter gear is rigidly mounted on one end of shaft 16. The shaft 16 is rotatably mounted in bearing member 17 which forms part of a yoke 18. The yoke 18 is slidably mounted upon the shaft 8 and holds the gears 12 and 15 in proper mesh relationship. Bearing member 19 is slidably positioned upon a shaft 20 extending between the mounting members 9 and 11. The yoke 18 is rigidly secured to the bearing member 19 so that the gears 18 and 15 can be longitudinally moved along the shaft 8, the shaft 20 preventing angular movement of the yoke 18. A threaded shaft 21 is threaded through the hub of gear wheel 22 which is positioned between the mounting member 11 and a mounting member 23, secured .to the mounting structure 3. The threaded shaft 21 abuts the yoke 18 in a manner such that rotation of the gear wheel 22 100 will cause the yoke 18 and the mechanical elements carried thereby to be lon itudinally moved along the shaft 8. The crank shaft 24 is rotatably mounted in the mounting structure 3 and a bearing member 25 and terminates in a worm wheel 26 engaging with gear wheel 22-, A. handle 27 is provided on the crank shaft 24 so that the gear wheel 22 may be conveniently rotated from a point adjacent the scanning wheel 1.

A sprocket wheel 28 is rigidly secured to the shaft 16 and engages one side of an endless chain 29. The endless chain 29 engages two sprocket wheels, 30 and 31, respectively. The sprocket wheel 30 is rotatably mounted in the bearing member 32 secured to the mounting structure 3, while the sprocket wheel 31 is rigidly secured to the armature shaft 33 of a motor 34. The motor 3 drives the chain 29 at a constant speed, while motion is transmitted therefrom by the sprocket wheel 28 through the gears 15 and 12 to the shaft 8 and thence through the gears 7 and 6 to the scanning disk 1.

The operation of the foregoing will be apparent from the following:

After the motor 3a has attained a speed such that the scanning disk 1 is rotated in proper synchronism, it is desirable to adjust the relative angular position of the lead hole 5 in order that an image can be properly framed, This is accomplished by rotating the crank shaft 24 in either of two directions so as to move the sprocket wheel linearly in either of two directions along the chain 29. It will be obvious that if the sprocket wheel 28 is moved in the direction of movement of the chain 29, during the interval of such movement fewer teeth of the sprocket wheel 28 will be engaged, per second, by the chain 29, and that, if the sprocket wheel 28 is moved in the direction opposite to the movement of the chain 29, more sprocket teeth, per second, will be engaged by the chain 29 during this movement interval. This will result in a momentary decrease or increase in the speed of revolution of the disk 1, so as to bring the lead hole 5 of the disk 1 into the proper relative angular position to satisfactorily frame the image. The synchronous speed of the motor 3% is undisturbed by this manipulation of crank shaft 24 and remains constant. It is evident that the speed of the disk 1 is retarded or accelerated only while the crank shaft 24 is being turned. The limit of movement along the chain 29 is determined so that the image as defined by the scanning disk 1 can be properly framed. A

It will beobvious that the system of my invention provides a novel means for adjusting the relative angular position of the series of scanning holes in a scanning disk without altering the speed of the dIlViD motor there for. Although I have shown a preferred enibodiment of my invention, it is of course to be understood that changes will readily occur to those skilled in the art but which will not depart from the intended scope of my invention. I do not, therefore, desire to limit my self to the foregoing, except insofar as may be pointed out in the appended claims.

What I claim as new and original and desire to secure by Letters Patent of the United States is:

1. Television apparatus comprising, a scanning disk, a motor, an endless chain adapted to be driven by said motor, a sprocket wheel adapted to engage with said chain, said sprocket wheel being adapted to drive said scanning disk; and means adapted to linearly move said sprocket wheel along said chain.

2. Television apparatus comprising, a scanning disk, a motor, an endless chain coupled to said motor, a sprocket wheel positioned in engagement with said endless chain, a mechanical coupling between said sprocket wheel and said scanning disk, and means adapted to move said sprocket wheel linearly along said chain.

3. Television apparatus comprising, a scanning disk, a motor, an endless chain adapted to be driven by said motor, a sprocket wheel adapted to be driven by said chain, a splined shaft mechanically coupled to said scanning disk, a gear wheel slidably but not rotatably mounted upon said shaft, a second gear Wheel in engagementwith said first mentioned gear wheel, a mechanical coupling between said second gear wheel and said sprocket wheel, a common supporting member for said gear wheels and said sprocket wheel, and means adapted to move said supporting member in a manner adapted to momentarily alter the speed of movement of said scanning disk without altering the speed of said motor.

CHARLES (E. VEltlliliLLlON.

ltd 

